Antipickable lock



y 3, 5 LE ROY OKANE 2,552,012

ANTIPICKABLE LOCK Filed May 17, 1947 2 Sheets-Sheet l INVENTOR.

Le Z29 0 Kane,

ATTORNEYS May 8, 1951 LE ROY O'KANE ANTIPICKABLE LOCK 2 Sheets-$heet 2Filed y 17, 1947 HYVENTOR. ie/Pg/ OKane;

Patented May 8, 1951 UNITED STATES PATENT OFFICE AN TIPIGKrQBLE LOCK LeRoy OKane, Pittsburgh, Pa.

Application May 17, 1947, Serial No. 748,771

This invention relates to an anti-pickable lock.

It is an object of the present invention to provide a lock which cannotbe readily picked by burglars and wherein there is provided internallyof the look a partition wall or shelf which prevents access to thetumbler pins and wherein a key passage is provided at an angle to thepassage into which the tumbler pins extend whereby the key, upon beinginserted, must be turned in order that it can register with a passageinto which the tumbler pins extend.

Other objects of the present invention are to provide an anti-pickablelock which is of simple construction, inexpensive to manufacture andefiicient in operation.

For other objects and for a better understanding of the invention,reference may be had to the following detailed description taken inconnection with the accompanying drawing, in which Figure 1 is a frontelevational view of the lock,

Figure 2 is a longitudinal cross-sectional view taken on line 2-2 ofFigure 1,

Figure 3 is a cross-sectional view taken on line 3-3 of Figure 2.

Figure 4 is a longitudinal cross-sectional view taken on line 4-4 ofFigure 1,

Figure 5 is a transverse cross-sectional view taken on line 5-5 ofFigure 4,

Figure 6 is a perspective view of the bolt looking upon one sidethereof,

Figure 7 is a perspective view of internal parts of the bolt,

Figure 8 is a transverse cross-sectional view taken on line 8-8 ofFigure 6,

Figure 9 is a transverse cross-sectional view taken on line 9-9 ofFigure 4,

Fig. 10 is an end view of Fig. 4 with the lock member removed.

Figure 11 is a cross-sectional view of a, modified form of bolt.

Referring now to the figures, l5 represents an internal key plug. Thiskey plug has a longitudinal passage I5 into which a key I! may extend.This passage It includes a part of round section l8 and a radiallyextending part |9 for receiving the radially extending portion 2| of thekey H. The rear part of the passage I6 is enlarged as shown in Figure 8at 23 so that the key, once it has been extended far enough into theopening Hi, can be turned so that the part 2| of the key can be axiallyaligned with a slot 24 whereby the key H, as it is pulled outwardly,will cause the part 2| to enter the slot '24. The part 3 Claims. (01.70-419) 2| of the key has the proper top edge and indentations so as toproperly place the tumblers 25 whereby to raise the spring pressedplungers 26 against the action of their springs 21 so that they will beproperly aligned to permit the key plug i5 and its sleeve 28 surroundingthe same to be turned. The sleeve 28 is closed at its forward end asindicated at 29 so as to be fitted into a cover plate 3| on the front ofthe lock. This portion 29 has an opening 32 which is in continuation ofthe opening It for receiving the key. The front of the opening 32 is cutaway or countersunk as indicated at 33 to facilitate the insertion ofthe key ll.

Once the tumbler pins 25 have been properly aligned with the key, thekey plug I5 and the sleeve 28 can be turned whereby to cause a boltreleasing member 34 on a projection 35 of the key plug 15 to be turnedso as to release the bolt parts of the lock, not shown. The plungerelements 25 are contained in a body part 31. Holes 38 in the sleeve 23are adapted to normally receive the plungers 26. These holes are alignedwith holes 39 in the key plug |5 containing the tumblers 25. The sleeve28 is fixed to the key plug l5 by screws 3 The part 34 is fixed to theprojection 35 by a screw 42.

Within the slot 24 there is extended a partition or shield 43 which isfixed against displacement by a fastening rivet 44. This shield 43prevents one from picking the lock and requires that a special key beused in order that the part of the key 2| can be slid up over the shield43. All of the parts thus far with the exception of part 34 are enclosedin a heavy casing 45.

Fixed against the end of the part 31 is a plate 4'! having an openingwith stop shoulders 48 and 49 for limiting the turning movement of thekey plug l5. On the key plug I5 is an arm 5| which will abut the stopshoulders 48 and 49 whereby to limit the turning movement of the keyplug.

In Figure 11 there is shown a slightly modified form of key plug I5provided with holes 39 for the reception of tumbler pins, the holesbeing intersected by a longitudinal slot 24 corresponding in function toslot 24, but in top of the bolt. When this type bolt is used the shelfor partition 43 may be omitted since the transverse portion 43 of theplug below the slot 24 serves the same purpose and functions in the samemanner.

While various changes may be made in the detail construction, it shallbe understood that such changes shall be within the spirit and scope ofthe present invention, as defined by the appended claims.

I claim:

1. An anti-pickable lock comprising rotatable key plug means having aplurality of radially extending openings, tumbler pins in the radiallyextending openings, 2. part surrounding the key plug means in which thekey plug means is rotatable and having plunger openings, plungers insaid plunger openings of the partand alignable with the tumbler pins todepress them and at times to enter the tumbler pin openings to.

lock the key plug means against turning move ment, a key passageextending longitudinally into.

the key plug means at an angle offset to the tumbler pins and having anenlargementinrear of the pins, to provide for the turning movement;

of a key having a radially extending part and insertable into thepassage, said key plugmeans having a slot in communication with theenlargement lot the passage and, aligned with the tumbler pins, wherebythe radially extending partof'thekey can be inserted to a position totherear of said tumbler pin openings and moved into said slot to raise.the pins and plungers whereby the key plug means can be rotated.

2. An anti-pickable lock as defined in claim 1, and a shield lyingbeneath and spaced from the tumbler pin openings and over which aportion of the radially extending part of the key must slide to operatethe tumbler pins, the key being provided with a longitudinally extendingslot in the radially extending part, open at the end towards the head ofthe key whereby the partial retraction thereof said portion will overliethe shield.

3. An anti-pickable lock as defined in claim 2 wherein the shieldcomprises an integral portion of the key plug means.

LEROY OKANE.

REFERENCES CITED The following references are of record in thefile-ofithis patent:

UNITED STATES PATENTS Number Name Date 321,306 Markham June 30, 18852,166,690 Neckerman July 18, 1939 2,179,947 Miller Nov. 14, 1939

